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ilbmtoppm - convert an ILBM file into a portable pixmap
ilbmtoppm
[-verbose] [-ignore<chunkID>] [-isham|-isehb] [-adjustcolors] [ILBMfile]
Reads
an IFF ILBM file as input. Produces a portable pixmap as output. Supported
ILBM types are:
- Normal ILBMs with 1-16 planes.
- Amiga Extra_Halfbrite (EHB)
-
- Amiga HAM with 3-16 planes.
-
- 24 bit.
- Multiplatte (normal or HAM) pictures.
- Color map (BMHD + CMAP chunk only, nPlanes = 0).
- Unofficial direct color.
- 1-16 planes for each color component.
- Chunks used:
- BMHD, CMAP, CAMG (only
HAM & EHB flags used), PCHG, BODY unofficial DCOL chunk to identify direct
color ILBM
- Chunks ignored:
- GRAB, DEST, SPRT, CRNG, CCRT, CLUT, DPPV, DRNG,
EPSF
- Other chunks (ignored but displayed in verbose mode):
- NAME, AUTH,
(c), ANNO, DPI
- Unknown chunks are skipped.
- -verbose
- Give some information
about the ILBM file.
- -ignore <chunkID>
- Skip a chunk. <chunkID> is the 4-letter
IFF chunk identifier of the chunk to be skipped.
- -isham | -isehb
- Treat the
input file as a HAM or Extra_Halfbrite picture, even if these flags or
not set in the CAMG chunk (or if there is no CAMG chunk).
- -adjustcolors
- If
all colors in the CMAP have a value of less then 16, ilbmtoppm assumes
a 4-bit colormap and gives a warning. With this option the colormap is scaled
to 8 bits.
The multipalette PCHG BigLineChanges and Huffman decompression
code is untested.
Amiga ROM Kernel Reference Manual - Devices (3rd
Ed.)
Addison Wesley, ISBN 0-201-56775-X
ppm(5)
, ppmtoilbm(1)
Copyright
(C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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